Fix MS warnings. Use ROCKSDB_Prsz for size_t.

Summary: Closes https://github.com/facebook/rocksdb/pull/1737

Differential Revision: D4378852

Pulled By: yiwu-arbug

fbshipit-source-id: ba8b02d

tools/db_bench_tool.cc

@@ -3430,11 +3430,11 @@ class Benchmark {
             continue;
           }
         }
-        writes_ /= open_options_.max_bytes_for_level_multiplier;
+        writes_ /= static_cast<int64_t>(open_options_.max_bytes_for_level_multiplier);
       }
       for (size_t i = 0; i < num_db; i++) {
         if (sorted_runs[i].size() < num_levels - 1) {
-          fprintf(stderr, "n is too small to fill %lu levels\n", num_levels);
+          fprintf(stderr, "n is too small to fill %" ROCKSDB_PRIszt " levels\n", num_levels);
           exit(1);
         }
       }
@@ -3481,11 +3481,11 @@ class Benchmark {
           }
           num_files_at_level0[i] = meta.levels[0].files.size();
         }
-        writes_ *= static_cast<double>(100) / (ratio + 200);
+        writes_ =  static_cast<int64_t>(writes_* static_cast<double>(100) / (ratio + 200));
       }
       for (size_t i = 0; i < num_db; i++) {
         if (sorted_runs[i].size() < num_levels) {
-          fprintf(stderr, "n is too small to fill %lu levels\n", num_levels);
+          fprintf(stderr, "n is too small to fill %" ROCKSDB_PRIszt  " levels\n", num_levels);
           exit(1);
         }
       }
@@ -3594,7 +3594,7 @@ class Benchmark {
     for (size_t k = 0; k < num_db; k++) {
       auto db = db_list[k];
       fprintf(stdout,
-              "---------------------- DB %lu LSM ---------------------\n", k);
+              "---------------------- DB %" ROCKSDB_PRIszt " LSM ---------------------\n", k);
       db->GetColumnFamilyMetaData(&meta);
       for (auto& levelMeta : meta.levels) {
         if (levelMeta.files.empty()) {